Speed-limiting device.



w. D. POMEROY & A. L. MQHUGH.

' SPEED LIMITING DEVICE. I

APPLICATION FILED HAILQ, 1905.

934,21 1 D Patented Sept. 14;, 909.

2 SHEE'1SSHEET I.

inventors.-

y I j Mlnasses:

W. D. POMEROY &: A. L. McHUGH.

SPEED LIMITING DEVICE.

APPLICATION TILED MAKQ, 1905.

Patented Sept. 14, 1909.

2 SHEETS-SHEET 2 in venfoas:

William: fi Pamerqy I I/z (messed wiLLIAM D. romniz'or, or nonwoon, mimrnonr L. maven, or chrom um;

omo, .essrcnoas TO THE BULLOCK ELECTRIC manuracrumue' COMPANY, A e

' To all whom it may concer Iii CORPORATION F OHIO.

. Be itknown that We, -VILLIAM D.'Po1u- E1101 and ANTHoN-r L. MoHUcH,citizens of the United States, residingat Norwoodand Cincinnati, in thecounty of Hamilton and State of Ohio, have -'invent'ed certain new anduseful Improvements-in Speed-Limiting De-. vices, of which the followngis a full, clear,

and exact specification.

Our invention relates to speed limiting devices 'as applied to rotatingparts of mach nes and more particularly as appliedto the rotatingmembers of dynamo electric ma-' chines of the rotary converter ormotor-generator type. p Our invent on is adapted 'for use in connectionwith a variety of types of machines,

but is especially applicab e. to rotary converters, which are;ordinarily employed to convert alternating current received from asource of supplyinto direct current which is fed into a directcurrent'distribution system.

Under certain abnormal conditions of field strength, load and voltage, acompound wound rotary converter will run as an inverted rotary and will,speedup to a da'ngerous extent. I It is .very desirable under thesecircumstances to provide some meansfor automatically regulating thesupply of current to the machine or for cutting off en- 'tirely thedirect current source of supply from the machine when its speedrisesabove a predetermined value.

The object of. our invention tolimit the speed of a dynamo electricmachine and more especially to eliminatethe danger resulting rom aderangement of the electrical connections of the machine and especiallyof the field circuits and of the alternating current supply circuits ofa rotary converter by means of a simple, efficient, and efi'ectivemechanism. V v

In one of its aspects our invention comprises the combination of adynamo electric machine having a circuit breaker -in the mains thereof,with a speed limiting device for said machine, said speedlimitingdevice, comprising a switch mounted in'proximity' to therotatable' member of the machine for controllin said circuit breaker,and, a-centrifugal' evice in operative relationship to said rotatablemember and adapted-to opersrnnn-L'mmmc ISEVICE;

Specification of Letters Patent. Patefitefl SeptfllA, 1909; I IApplication filed March 9, 1905. Serial no. 249,185.

ate the switchwhen the speed of th e'rota ta; ble member reaches apredetermined value.

In another of its aspects the invention .55

comprises the combination of a rotatable member, a switch mountedadjacent to said member and means carried by said rotatable .member forcausing the operation of said,

and more specifically set forth in the ap-fcs 'pendeiclaimsfl Theinvention will be more. clearly -under-- stood by reference totheaccompanying drawings, inwhich y Figure 1; represents anend view'of a'rotatablem'ember, such as-the'shaft of a dy -namo e lectric machine,equipped with our improved centrifugally operated switch; Fig. 2 is averticalsectional view'on th'e'line- 22 of Fi 1; Fig. 3 is 'a' view ofthe switch shown in lig '1 in its open position; l ign' i: is asectional elevation on theline L- t of Fig. 5 'showin a slightlymodified form of our centrifuga ly operated switch; Fig. 5 is asectional new on the line 5'-5'of Fi 4.

Referring'now to the preferred, modification of our. improved speedlimiting'device, illustrated in Fi s. 1, 2, and '3, the rotatablemember, or sha is illustrated at 8; This shaft rotates in a bearing, thehousing of 85, which is indicated at 9. Fastened by means v of bolts 11to said housing adjacent td'the' shaft is a casing 10 provided at itslower end with a pocket 12 containing the centrifugally operated switch.The movable'menk. 9o

ber of this switch is shown 'at- 13, pivoted :to .the adjustable block14 at 15.- This movable member is provided with the' handlelfi and thebridging contact 17, the latter being insuf lated from, the member 13.'The bridging member '17 is adapted to connect electrically the contacts18 and 19 of the switch. The sprin 20, one end of which is attached to'the a justable block 14: at 21, and the tither end ofwhich -is attachedto lug 22- formed' integral with the blade. 13, tends normally" to movesaid switch blade into one of its op- 'erative positions. In thepreferred modification shown in 'Figsl, 2, and 3, the spring tendsnormally to open the switch, The

switch is prevented from openingby holding I uneans, such as a latch ordog 23. This dog is pivoted to the adjustable block 14 at 24 and isnormally maintained in a vertical p05 sition, jas shown in Fig. 1, bymeans of the springs 25 so as to engage the'notch 26 in I the switchmember 13. The uplper'end 27 of t to trip the dog to permit the'switcsaidxlo'g projects into the pat predetermined value. Said centrifugalde- 1 vice comprises a spindle 30 carrying the weight 31, adapted'to.move outwardly relative to the-axis of rotation of the rotatable member8 against the action 'ofspring 32.

The'spindle 30 is constrained to move in the guides 33' and 34 formed inthe frame 35,

which is fastened to the rotatable-member by nieansofthe bolts 36. For adefinite speed of; theishaftor'rotatable member 8 .the outer end ofthespindle 30 will followa definite path. This path chan es as the speedchanges. Therefore to a just the device so as'to' operate the switch atany desired speed,

cwe' mount the switch and dog upon the ad-- ju'stable block 14 and soarrange said block as tomove upon the'vertical ide 'pins'40 under'theaction of the adjusting screw 41.

l The casing 10 is provided with a cover 10"- which is readilyremovableso that the mechanism contained within said casingmay be.

readil inspected.

' 'In t e preferred modification, the contacts a 18 and 19 and bridgingmember 17- control the circuit breaker 43 o cated in thejmains 44 and 45leading to the dynamo electric machine 46. This dynamo electric machinemay be a rotary converter or any other ty e of machine to which myinventlon is app is cable, and the shaft 8-may form part-of saidmachine, or 46 may be an independent machine connected to and drivingshaft 8. The

circuit breaker is diagrammatically illustrated as biased to openposition by means of the spring 47 and held in its closed ositionbymeans of the pivoted latch 48, w ich' is operated in one direction bythe solenoid 49 and in the opposite direction b the spring .50. Thesolenoid 49 is connecte in a shunt circuit 51 across the mains 44and 45.The

eurrent normally, flows through this shunt circuit 51 through contacts17, 18, and 19 of the controlling switch, through the solenoid 49 tomain 44 So long as the solenoid'49 remains energized, its core-willholdthe catch 48 in position against the action of spring so as to holdthe circuit-breaker 43 in its closed position against the action ofspring 47. If in the operation of the shaft 8,

- its speed rises abovea predeterminedvalue,

the spindle 30 will move outwardly under" and permits the switc spring50 to tri t V the action of centrifugal force and its outer end willstrike the upper end 27 of, the dog 23- and move said dog against theaction ofone of its springs 25 into the position shown in Fig. 3.- Thismovement releases the memher 13 from the holdin actionof said dog to beopened by spring20. The opening of said switch iin-' mediatelydeenergizes the solenoid 49 and the catch 48 is moved by spring 50,permitting the circuit breaker 43 to be opened.- by spring 47 and to cutoit the supplyof cur rent to the dynamo electric machine 46.v The switchcontrollin' said circuit breaker. is closed by means 0 the handle 16,andwhen closed the dog 23 is moved by means of itsspring 25automatically into such a positionas to permit vthe lower end of; the M0g to-engage the notch 26 and retainthe switch in saidclosed positionuntil trippedsb again by the centrifugal device. When our improved speedlimiting device is applied to a rotary converter, 46 illustrates thecornmutato'r of the direct current side of the machine and when thespeed'of said machine'so risesabo've a predetermined'value the directcurrent side of the machine is cut ofi V the direct current mains'44 and45. Referring now tothe modification illustrated in Li s. 4 and 5,the.centrifuga1'deas vice mounte upon the end'ofshaft 8 is sub; stantiallythe same'as that illustrated in the V modification shown inl igszl, 2,and 3. In this modification-(Figs 4 and 5) the dog 23 is omitted antlthespindle 30 acts. directly 1oQ- upon the switch arm'13, whichisl'throw'n from? an open positlon, as shown in Fig. 4,.4

into a closed position in engagement with the contacts 18 and 19", said;last mentioned contacts being connected in a shunt circuit across themains-44 and 45 through'anad.- justable resistance 52. i Located inthisshunt '1,- circuit 51 is'a solenoid49 which operatesupon the. catch 48 aainst the action of a" v ecircuit break'eri 43 when said solenoi isenergi'zedby the-dos" ing of the cen'trifu lly operated switch. The saidcentrifuge y operated-j switch 'is mounted upon the adjustableblock 14,which is slidable 'on the pins .40, and is adjustable by means," of theadjusting screw 41; The movable arm 13- of saidlswitch'islpiuoted saidblock at 15 and in its .open'positio'r'i?" abuts against the stop 55,being held in said position b the sprin 20, one end ofwhich 20 isfastene to the adjustableblock' 14 at 21 and the other end ofi-whichis"attachedto thei-lugf22 formed integral -with the pivoted ,4,

at when the .125

switch ni mint'ed acjment said rota 3 V membm', 21 cenhimgal rlmice an'ic fl by szud n 1 '50 cause the operation H a predetermined s1 d bu!reached in either said membe' and 151 :7 switch r'L-lahve to .x'we. soHmi' the switch wired $130011 of fluid 1 211821318 11); idjusii said (-umay 0(- 012w member.

(3 in mm swiivh 111 mm {:21 mid swim-h in (kntififuggyli def inflatablemember, :1 U; szud mummy.

position, a

- id mintnblv Hid 1 means for nmving said :noiher position when ingmenus, and means on o f said sv-aifch r011 levice. :1 mintzable n.m1l.)01', a mi {0 said numflJ-el',

movable member 0% 9O 'nxl pussi'ism F'or moving said member mw :mulbrjflsiiiml when Qalriard from sun hm'dmg means, sand (501.-

rl'fue'al dm'me comprlsmg a weighted splua dynmnq Elect ic um "Us, andmeans for const 'uini'ng said spi M16 1 7 l a I v l lrmutbreuk fue mumshmdmg to move away "from Ihe axis oi rofimon of dwvn-e 011111 i1 0 speedof same m the mi hr movable 1; 02", and means "11 number luio 21110 smdswitch member in its other operative position ranged to cause saidswitch to open when the speed of the shatt exceeds a predeterminedvalue, and means for adjusting the distance of said switch from theshaft to vary the speed at Which-the switch will be-opened.

11. In combination, a rotatable member, a switch mounted ad acentto saidmember and biasedtoward one operative position, a dog which in itsmiddle position holds said switch in the other operative position, and acentrifugal device mounted on said rotatable member and arranged to movesaid dog out of its middle position when the speed of said rotatablemember exceeds a predetermined value in either direction? 12. Incombination, a rotatable member, a switch mounted adjacent to saidmember and biased toward one operative position, a dog which initsmiddle position holds said switch in the other operative position, acentrifugal device mounted on said rotatable memberand arranged to movesaid dog out of its middle position when the speed of said rotatablemember exceeds a predetermined value in either direction, and acentering spring for said dog.

13. In combination, a rotatable member, a switch mounted adj acent tosaid member and biased" toward one operative position, a dog rection orthe other at a predetermined speed of the rotatable member in eitherdirection, the direction ofmovenient of the depending on thedirection ofrotation of therotatable member. I

14-. In combination, a rotatable member, a switch mounted adjacent tosaid member and biased toward one operative position, a dog which in itsmiddle position holds said switch in the other operative position, acentrifugal device mounted on a rotatable member and arranged to engagesaid dog-and moveit out of its middle position in one direction or theother at a predetermined speed of the rotatable member in eitherdirection, the direction ot'moveinent, of the dog depending on thedirection of rotation of the rotatable member, and a centering springfor said (10 15. In combination, a rotatable member, a switch mountedadjacent tosaid member and biased toward one operative position, a dog01 holding said switch in its other operative position, means carried bysaid rotatable member for moving said dog out of holding position at apredetermined speed of said member, and means for adjusting said dogrelative to the aforesaid means.

1n testlmony whereof we ailix our signatures, in the presence of twowitnesses.

WILLIAM D. POMEROY. ANTHONY L. MGHUGH.

